[sandsand244263]

Fixes #193.

Problem

list-game-ruleset-schemas aborts with a NullReferenceException on the current live build (CN 2.25.0.0.154461N, DataTool v2.25.0.0+1151), so the custom-game setting schema cannot be dumped at all. list-game-rulesets fails in the same model code.

GameRulesetSchemaEntry.cs:38 dereferences two reference-typed values without checking them:

DefaultValue = val2.m_default.ToString(),
Choices = val2.m_3FE1EA9E.Select(...).ToArray()

• val2.m_3FE1EA9E (the enum choice array) is null for at least one entry on this build → .Select() throws
• val2.m_default is a teStructuredDataAssetRef<STUIdentifier> reference type and can also be null → would throw one line earlier

Because the exception escapes from the Select in GameRulesetSchema.Init, the whole dump dies on the first malformed entry.

Change

Null-conditional access with a safe fallback:

DefaultValue = val2.m_default?.ToString(),
Choices = val2.m_3FE1EA9E?.Select(x => new RulesetSchemaValueEnumChoice {
    DisplayText = GetString(x.m_displayText),
    Identifier = x.m_identifier
}).ToArray() ?? Array.Empty<RulesetSchemaValueEnumChoice>()

Plus using System; for Array.Empty.

No behaviour change for well-formed entries — the same data is produced when the fields are present.

Verification

On the same client that previously crashed:

DataTool.exe "E:/Overwatch" list-game-ruleset-schemas --language=zhCN --rcn --json --out=ruleset_schemas.json
[Core] Execution finished in 00:00:00.51

→ ruleset_schemas.json, 125 schemas written, no exception.

(Array.Empty<T>() requires System; added that using to the file.)

[sandsand244263]

Understood — thanks for taking a look. I will keep it local on my side. Closing this to keep the tracker clean.